<template>
  <j-modal
      :confirmLoading="confirmLoading"
      :visible="visible"
      :width="modalWidth"
      cancelText="关闭"
      switchFullscreen
      title="选择部门"
      wrapClassName="j-depart-select-modal"
      @cancel="handleCancel"
      @ok="handleSubmit"
      @update:fullscreen="isFullscreen">
    <a-spin :spinning="false" tip="Loading...">
      <a-input-search placeholder="请输入部门名称按回车进行搜索" style="margin-bottom: 1px" @search="onSearch"/>
      <a-tree
          :autoExpandParent="autoExpandParent"
          :checkStrictly="checkStrictly"
          :checkedKeys="checkedKeys"
          :class="treeScreenClass"
          :expandedKeys="expandedKeys"
          :treeData="treeData"
          checkable
          @check="onCheck"
          @expand="onExpand"
          @select="onSelect">

        <template slot="title" slot-scope="{title}">
          <span v-if="title.indexOf(searchValue) > -1">
            {{ title.substr(0, title.indexOf(searchValue)) }}
            <span style="color: #f50">{{ searchValue }}</span>
            {{ title.substr(title.indexOf(searchValue) + searchValue.length) }}
          </span>
          <span v-else>{{ title }}</span>
        </template>
      </a-tree>
    </a-spin>
    <!--底部父子关联操作和确认取消按钮-->
    <template v-if="treeOpera && multi" slot="footer">
      <div class="drawer-bootom-button">
        <a-dropdown :trigger="['click']" placement="topCenter" style="float: left">
          <a-menu slot="overlay">
            <a-menu-item key="1" @click="switchCheckStrictly(1)">父子关联</a-menu-item>
            <a-menu-item key="2" @click="switchCheckStrictly(2)">取消关联</a-menu-item>
          </a-menu>
          <a-button>
            树操作
            <a-icon type="up"/>
          </a-button>
        </a-dropdown>
        <a-button style="margin-right: 0.8rem" type="primary" @click="handleCancel">关闭</a-button>
        <a-button type="primary" @click="handleSubmit">确认</a-button>
      </div>
    </template>
  </j-modal>
</template>

<script>
import {queryDepartTreeList} from '@/api/api'

export default {
  name: 'JSelectDepartModal',
  props: ['modalWidth', 'multi', 'rootOpened', 'departId', 'store', 'text', 'treeOpera'],
  data() {
    return {
      visible: false,
      confirmLoading: false,
      treeData: [],
      autoExpandParent: true,
      expandedKeys: [],
      dataList: [],
      checkedKeys: [],
      checkedRows: [],
      searchValue: "",
      checkStrictly: true,
      fullscreen: false
    }
  },
  created() {
    this.loadDepart();
  },
  watch: {
    departId() {
      this.initDepartComponent()
    },
    visible: {
      handler() {
        this.initDepartComponent(true)
      }
    }
  },
  computed: {
    treeScreenClass() {
      return {
        'my-dept-select-tree': true,
        'fullscreen': this.fullscreen,
      }
    },
  },
  methods: {
    show() {
      this.visible = true
      this.checkedRows = []
      this.checkedKeys = []
    },
    loadDepart() {
      // 这个方法是找到所有的部门信息
      queryDepartTreeList().then(res => {
        if (res.success) {
          let arr = [...res.result]
          this.reWriterWithSlot(arr)
          this.treeData = arr
          this.initDepartComponent()
          if (this.rootOpened) {
            this.initExpandedKeys(res.result)
          }
        }
      })
    },
    initDepartComponent(flag) {
      let arr = []
      //该方法两个地方用 1.visible改变事件重新设置选中项 2.组件编辑页面回显
      let fieldName = flag == true ? 'key' : this.text
      if (this.departId) {
        let arr2 = this.departId.split(',')
        for (let item of this.dataList) {
          if (arr2.indexOf(item[this.store]) >= 0) {
            arr.push(item[fieldName])
          }
        }
      }
      if (flag == true) {
        this.checkedKeys = [...arr]
      } else {
        this.$emit("initComp", arr.join(','))
      }
    },
    reWriterWithSlot(arr) {
      for (let item of arr) {
        if (item.children && item.children.length > 0) {
          this.reWriterWithSlot(item.children)
          let temp = Object.assign({}, item)
          temp.children = {}
          this.dataList.push(temp)
        } else {
          this.dataList.push(item)
          item.scopedSlots = {title: 'title'}
        }
      }
    },
    initExpandedKeys(arr) {
      if (arr && arr.length > 0) {
        let keys = []
        for (let item of arr) {
          if (item.children && item.children.length > 0) {
            keys.push(item.id)
          }
        }
        this.expandedKeys = [...keys]
        //全部keys
        //this.allTreeKeys = [...keys]
      } else {
        this.expandedKeys = []
        //this.allTreeKeys = []
      }
    },
    onCheck(checkedKeys, info) {
      if (!this.multi) {
        let arr = checkedKeys.checked.filter(item => this.checkedKeys.indexOf(item) < 0)
        this.checkedKeys = [...arr]
        this.checkedRows = (this.checkedKeys.length === 0) ? [] : [info.node.dataRef]
      } else {
        if (this.checkStrictly) {
          this.checkedKeys = checkedKeys.checked
        } else {
          this.checkedKeys = checkedKeys
        }
        this.checkedRows = this.getCheckedRows(this.checkedKeys)
      }
    },
    onSelect(selectedKeys, info) {
      //取消关联的情况下才走onSelect的逻辑
      if (this.checkStrictly) {
        let keys = []
        keys.push(selectedKeys[0])
        if (!this.checkedKeys || this.checkedKeys.length === 0 || !this.multi) {
          this.checkedKeys = [...keys]
          this.checkedRows = [info.node.dataRef]
        } else {
          let currKey = info.node.dataRef.key
          if (this.checkedKeys.indexOf(currKey) >= 0) {
            this.checkedKeys = this.checkedKeys.filter(item => item !== currKey)
          } else {
            this.checkedKeys.push(...keys)
          }
        }
        this.checkedRows = this.getCheckedRows(this.checkedKeys)
      }
    },
    onExpand(expandedKeys) {
      this.expandedKeys = expandedKeys
      this.autoExpandParent = false
    },
    handleSubmit() {
      if (!this.checkedKeys || this.checkedKeys.length == 0) {
        this.$emit("ok", '')
      } else {
        let checkRow = this.getCheckedRows(this.checkedKeys)
        let keyStr = this.checkedKeys.join(",")
        this.$emit("ok", checkRow, keyStr)
      }
      this.handleClear()
    },
    handleCancel() {
      this.handleClear()
    },
    handleClear() {
      this.visible = false
      this.checkedKeys = []
    },
    getParentKey(currKey, treeData) {
      let parentKey
      for (let i = 0; i < treeData.length; i++) {
        const node = treeData[i]
        if (node.children) {
          if (node.children.some(item => item.key === currKey)) {
            parentKey = node.key
          } else if (this.getParentKey(currKey, node.children)) {
            parentKey = this.getParentKey(currKey, node.children)
          }
        }
      }
      return parentKey
    },
    onSearch(value) {
      const expandedKeys = this.dataList.map((item) => {
        if (item.title.indexOf(value) > -1) {
          return this.getParentKey(item.key, this.treeData)
        }
        return null
      }).filter((item, i, self) => item && self.indexOf(item) === i)

      Object.assign(this, {
        expandedKeys,
        searchValue: value,
        autoExpandParent: true,
      })


    },
    // 根据 checkedKeys 获取 rows
    getCheckedRows(checkedKeys) {
      const forChildren = (list, key) => {
        for (let item of list) {
          if (item.id === key) {
            return item
          }
          if (item.children instanceof Array) {
            let value = forChildren(item.children, key)
            if (value != null) {
              return value
            }
          }
        }
        return null
      }

      let rows = []
      for (let key of checkedKeys) {
        let row = forChildren(this.treeData, key)
        if (row != null) {
          rows.push(row)
        }
      }
      return rows
    },
    switchCheckStrictly(v) {
      if (v == 1) {
        this.checkStrictly = false
      } else if (v == 2) {
        this.checkStrictly = true
      }
    },
    isFullscreen(val) {
      this.fullscreen = val
    }
  }
}

</script>

<style lang="less" scoped>
// 限制部门选择树高度，避免部门太多时点击确定不便
.my-dept-select-tree {
  height: 350px;

  &.fullscreen {
    height: calc(100vh - 250px);
  }

  overflow-y: scroll;
}

.drawer-bootom-button {
  position: absolute;
  bottom: 0;
  width: 100%;
  border-top: 1px solid #e8e8e8;
  padding: 10px 16px;
  text-align: right;
  left: 0;
  background: #fff;
  border-radius: 0 0 2px 2px;
}
</style>